In current fashion

With a confusing array of choices when it comes to eddy current separators, Resource asked a couple of professionals to explain the workings of their chosen bits of kit 


Master Magnets ECS125 reviewed by Marshall Gralnick from Global Equipment Mktg Inc 

The unit pictured is simliar to Global Equipment Mktg's Master Magnets ECS125 separator

This machine was purchased for the separation of non-ferrous metals at a landfill that incinerates incoming household waste. This non-ferrous material originally was landfilled after incineration, but using eddy current separation (ECS) has become profitable for the business.

This ECS125 is installed onto a stepdeck trailer for mobility. Some modifications had to be done to the trailer to accommodate the ECS, magnet and vibratory feeder, for it to be operated in an efficient manner, as well as some changes made to the ECS controls, due to the harsh environment. The unit was initially used at a landfill in Pompano Beach, Florida, and has since been moved to another landfill in Davie, Florida.

The quality of the separation is very high, with a non-ferrous separation rate over 90 per cent. After two years in operation, there has been very little downtime or spare parts replacement. Besides the replacement of the brushes on the rotary belt cleaner for prevention of ash build-up, the only continuous maintenance has to do with the conveyor belt operating in this harsh environment.

There are two vital components in this system. First, the vibratory feeder, which aids in evenly distributing the material onto the ECS conveyor so there is an even single layer of material across the entire width of the conveyor – important for the ECS to do its job. Second, the rotary brush cleaner, installed at the underside and return of the ECS conveyor belt – below and directly behind the ECS Rotor – is as important as any part of the ECS. This is especially so with ash, which has the tendency to build up on the belt, as the brushes clean off the ash before it has a chance to adhere to the belt.

Eriez RevX-E-LT-80 reviewed by Adie Mason, Wood Sector Manager for SITA UK

Eriez RevX-E-LT-80 with OBM vibratory feeder installed at one SITA UK's wood processing plants

SITA UK has a network of specialist wood processing facilities with the capability to accept mixed grades of wood and has installed Eriez equipment at three of those sites – Binn Farm near Perth, Ellington near Ashington and Clifton Marsh near Preston.

This article was taken from Issue 75

The eddy current separator (ECS) is an integral part of our process line, which is located outside and exposed to the elements. Space on processing sites can be a valuable commodity in its own right, so it’s key that we can work with our suppliers to configure equipment. 

We process all grades of recovered waste wood to the exacting specification of our customers, so it is important that we are able to effectively extract metal contaminants, including non-ferrous metals extracted by Eriez’s equipment.

The RevX-E LT is designed for the separation of particles over 25 millimetres (mm), and in our case has a feed width of two metres, suitable for handling up to 40 tonnes per hour. (Newer models, such as the ST22, are specifically designed for particles below 12mm, utilising a carbon-fibre shell rotor and fine splitter.) For SITA, it has been fitted with an OBM feeder for dispersion of the particles across the width of the belt to improve separation. This gives a more consistent flow of material, which aids production continuity.

The Eriez equipment features a rare earth magnetic rotor, a three-mm thick PVC belt and stand-alone control panel inclusive of inverters to control the speed of rotor motors.

We’re very pleased with the performance. Along with other kit we employ to pull out ferrous metals, it contributes to a process that can produce a high-quality material that meets the demands and expectations of our customers. What makes the RevX-E-LT-80 good at the job is its reliability, resulting in a low maintenance requirement.